Microstructural Modifications of As-Cast High-Chromium White Iron by Heat Treatment View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2008-09-04

AUTHORS

A.E. Karantzalis, A. Lekatou, H. Mavros

ABSTRACT

The initial as-cast microstructure of a high-chromium (2.35% C, 18.23% Cr) white cast iron consisting of primary austenitic dendrites and a eutectic mixture of M7C3 carbides/austenite was extensively modified by four different heat treatments: H.T.A: destabilization (970 °C-2.5 h), H.T.B: destabilization/subcritical treatments (970 °C-2.5 h + 600 °C-13 h), H.T.C: subcritical treatment (600 °C-13 h) and H.T.D: subcritical/destabilization treatments (600 °C-13 h + 970 °C-2.5 h). H.T.A leads to martensitic structures that present considerable precipitation of cubic secondary carbide particles of M23C6 type. H.T.B produces pearlitic structures and causes further carbide precipitation and pre-existent carbide particle shape modifications. H.T.C extensively modifies the initial as-cast structure to more pearlitic morphologies accompanied with spheroidization/degradation of the M7C3 primary carbide structure. H.T.D causes extensive formation of secondary carbide particles within the primary austenitic matrix; the latter has been mainly transformed to martensite. The effect of each heat treatment on the hardness of the alloy was correlated with the attained microstructure. More... »

PAGES

174-181

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11665-008-9285-6

DOI

http://dx.doi.org/10.1007/s11665-008-9285-6

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1009519870


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